Q: my ipad 4 will not charge

Options are

1. Try a different charger - preferably an original Apple or one with MFi certification in a wall socket for at least one hour

2. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

If your iPhone, iPad, or iPod touch won't charge - Apple Support

Hi,

I had this issue on my iPad air 2 and a simple reboot helped resolve it.

If you have no luck, check out this guide:

If your iPhone, iPad, or iPod touch won't charge - Apple Support

Let me know on your progress, good luck and all the best.

Are you using the USB power adapter that came with the iPad?  The USB port on your computer and lower-wattage USB power adapters may not supply enough power to charge your iPad.